﻿/**

 * Copyright (c) 2015-2017, FastDev 刘强 (fastdev@163.com).

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

using OF.ILModifier.Entity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace OF.ILModifier.Common
{
    public static class FieldHelper
    {
        private static Dictionary<FieldKey, FieldInfo> fieldDict = new Dictionary<FieldKey, FieldInfo>();
        public static FieldInfo GetField(FieldKey fieldKey)
        {
            FieldInfo result = null;
            if(fieldDict.TryGetValue(fieldKey, out result))
            {
                return result;
            }
            result = fieldKey.DeclaringType.GetField(fieldKey.FieldName, BindingFlags.CreateInstance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
            fieldDict.Add(fieldKey, result);
            return result;
        }

        public static void Copy(FieldKey fieldKey, object fromObj, object toObj)
        {
            FieldInfo field = GetField(fieldKey);
            var copyValue = field.GetValue(fromObj);
            field.SetValue(toObj, copyValue);
        }

        public static void Set(FieldKey fieldKey, object toObj, object copyValue)
        {
            FieldInfo field = GetField(fieldKey);
            field.SetValue(toObj, copyValue);
        }
    }
}
